dns.ex

"google.com"
|> String.to_charlist()
|> :inet_res.lookup(:in, :a)
|> Enum.reduce([], fn ip, acc ->
  [
    ip
    |> Tuple.to_list()
    |> Enum.join(".")
    | acc
  ]
end)

'www.google.com'
|> :inet_res.getbyname(:a)
|> case do
  {:ok, {_, _, _, _, _, ips}} ->
  ips
  |> Enum.reduce([], fn ip, acc ->
    [
    ip
    |> Tuple.to_list()
    |> Enum.join(".")
    | acc
  ]
  end)
end